IGF-1 – what do we know about him?

Mice modified for IGF-1 expression had much faster muscle recovery. The hypertrophic effects of IGF-1 administration are well documented in animals and in studies on cell lines.

IGF-1 expression is increased in rats and in people performing strength exercises. The weightlifters had more IGF-1 from the volleyball players, moreover, the weightlifters had as many as 27% more IGF-1 from non-exercisers. However, we are constantly learning more about IGF-1 and its role in muscle growth. There are many question marks here.

It turns out that

The conclusions, probably self-administration of IGF-1 is not conducive to hypertrophy, if it is not supported by strength training. Muscle electrical stimulation is not able to replace weight training in healthy people.